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<div id="overview"><a href="../../../../../../../api/org/jboss/netty/channel/socket/nio/NioDatagramWorker.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.channel.socket.nio;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.buffer.ChannelBuffer;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.buffer.ChannelBufferFactory;
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.Channel;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelException;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelFuture;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.MessageEvent;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ReceiveBufferSizePredictor;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.socket.nio.AbstractNioChannel.WriteRequestQueue;
<a class="jxr_linenumber" name="26" href="#26">26</a>  
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.net.SocketAddress;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> java.nio.ByteBuffer;
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> java.nio.channels.AsynchronousCloseException;
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> java.nio.channels.ClosedChannelException;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> java.nio.channels.DatagramChannel;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> java.nio.channels.SelectionKey;
<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> java.nio.channels.Selector;
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> java.util.Queue;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.Executor;
<a class="jxr_linenumber" name="37" href="#37">37</a>  
<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> <strong class="jxr_keyword">static</strong> org.jboss.netty.channel.Channels.*;
<a class="jxr_linenumber" name="39" href="#39">39</a>  
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> * A class responsible for registering channels with {@link Selector}.</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * It also implements the {@link Selector} loop.</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramWorker.html">NioDatagramWorker</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/AbstractNioWorker.html">AbstractNioWorker</a> {
<a class="jxr_linenumber" name="45" href="#45">45</a>  
<a class="jxr_linenumber" name="46" href="#46">46</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/SocketReceiveBufferAllocator.html">SocketReceiveBufferAllocator</a> bufferAllocator = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/SocketReceiveBufferAllocator.html">SocketReceiveBufferAllocator</a>();
<a class="jxr_linenumber" name="47" href="#47">47</a>  
<a class="jxr_linenumber" name="48" href="#48">48</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment">     * Sole constructor.</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment">     * @param executor the {@link Executor} used to execute {@link Runnable}s</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment">     *                 such as {@link ChannelRegistionTask}</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>      <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramWorker.html">NioDatagramWorker</a>(<strong class="jxr_keyword">final</strong> Executor executor) {
<a class="jxr_linenumber" name="55" href="#55">55</a>          <strong class="jxr_keyword">super</strong>(executor);
<a class="jxr_linenumber" name="56" href="#56">56</a>      }
<a class="jxr_linenumber" name="57" href="#57">57</a>  
<a class="jxr_linenumber" name="58" href="#58">58</a>      @Override
<a class="jxr_linenumber" name="59" href="#59">59</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> read(<strong class="jxr_keyword">final</strong> SelectionKey key) {
<a class="jxr_linenumber" name="60" href="#60">60</a>          <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramChannel.html">NioDatagramChannel</a> channel = (NioDatagramChannel) key.attachment();
<a class="jxr_linenumber" name="61" href="#61">61</a>          <a href="../../../../../../org/jboss/netty/channel/ReceiveBufferSizePredictor.html">ReceiveBufferSizePredictor</a> predictor =
<a class="jxr_linenumber" name="62" href="#62">62</a>              channel.getConfig().getReceiveBufferSizePredictor();
<a class="jxr_linenumber" name="63" href="#63">63</a>          <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/buffer/ChannelBufferFactory.html">ChannelBufferFactory</a> bufferFactory = channel.getConfig().getBufferFactory();
<a class="jxr_linenumber" name="64" href="#64">64</a>          <strong class="jxr_keyword">final</strong> DatagramChannel nioChannel = (DatagramChannel) key.channel();
<a class="jxr_linenumber" name="65" href="#65">65</a>          <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> predictedRecvBufSize = predictor.nextReceiveBufferSize();
<a class="jxr_linenumber" name="66" href="#66">66</a>  
<a class="jxr_linenumber" name="67" href="#67">67</a>          <strong class="jxr_keyword">final</strong> ByteBuffer byteBuffer = bufferAllocator.get(predictedRecvBufSize).order(bufferFactory.getDefaultOrder());
<a class="jxr_linenumber" name="68" href="#68">68</a>  
<a class="jxr_linenumber" name="69" href="#69">69</a>          <strong class="jxr_keyword">boolean</strong> failure = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="70" href="#70">70</a>          SocketAddress remoteAddress = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="71" href="#71">71</a>          <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="72" href="#72">72</a>              <em class="jxr_comment">// Receive from the channel in a non blocking mode. We have already been notified that</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>              <em class="jxr_comment">// the channel is ready to receive.</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>              remoteAddress = nioChannel.receive(byteBuffer);
<a class="jxr_linenumber" name="75" href="#75">75</a>              failure = false;
<a class="jxr_linenumber" name="76" href="#76">76</a>          } <strong class="jxr_keyword">catch</strong> (ClosedChannelException e) {
<a class="jxr_linenumber" name="77" href="#77">77</a>              <em class="jxr_comment">// Can happen, and does not need a user attention.</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>          } <strong class="jxr_keyword">catch</strong> (Throwable t) {
<a class="jxr_linenumber" name="79" href="#79">79</a>              fireExceptionCaught(channel, t);
<a class="jxr_linenumber" name="80" href="#80">80</a>          }
<a class="jxr_linenumber" name="81" href="#81">81</a>  
<a class="jxr_linenumber" name="82" href="#82">82</a>          <strong class="jxr_keyword">if</strong> (remoteAddress != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="83" href="#83">83</a>              <em class="jxr_comment">// Flip the buffer so that we can wrap it.</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>              byteBuffer.flip();
<a class="jxr_linenumber" name="85" href="#85">85</a>  
<a class="jxr_linenumber" name="86" href="#86">86</a>              <strong class="jxr_keyword">int</strong> readBytes = byteBuffer.remaining();
<a class="jxr_linenumber" name="87" href="#87">87</a>              <strong class="jxr_keyword">if</strong> (readBytes &gt; 0) {
<a class="jxr_linenumber" name="88" href="#88">88</a>                  <em class="jxr_comment">// Update the predictor.</em>
<a class="jxr_linenumber" name="89" href="#89">89</a>                  predictor.previousReceiveBufferSize(readBytes);
<a class="jxr_linenumber" name="90" href="#90">90</a>  
<a class="jxr_linenumber" name="91" href="#91">91</a>                  <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/buffer/ChannelBuffer.html">ChannelBuffer</a> buffer = bufferFactory.getBuffer(readBytes);
<a class="jxr_linenumber" name="92" href="#92">92</a>                  buffer.setBytes(0, byteBuffer);
<a class="jxr_linenumber" name="93" href="#93">93</a>                  buffer.writerIndex(readBytes);
<a class="jxr_linenumber" name="94" href="#94">94</a>  
<a class="jxr_linenumber" name="95" href="#95">95</a>                  <em class="jxr_comment">// Update the predictor.</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>                  predictor.previousReceiveBufferSize(readBytes);
<a class="jxr_linenumber" name="97" href="#97">97</a>  
<a class="jxr_linenumber" name="98" href="#98">98</a>                  <em class="jxr_comment">// Notify the interested parties about the newly arrived message.</em>
<a class="jxr_linenumber" name="99" href="#99">99</a>                  fireMessageReceived(
<a class="jxr_linenumber" name="100" href="#100">100</a>                         channel, buffer, remoteAddress);
<a class="jxr_linenumber" name="101" href="#101">101</a>             }
<a class="jxr_linenumber" name="102" href="#102">102</a>         }
<a class="jxr_linenumber" name="103" href="#103">103</a> 
<a class="jxr_linenumber" name="104" href="#104">104</a>         <strong class="jxr_keyword">if</strong> (failure) {
<a class="jxr_linenumber" name="105" href="#105">105</a>             key.cancel(); <em class="jxr_comment">// Some JDK implementations run into an infinite loop without this.</em>
<a class="jxr_linenumber" name="106" href="#106">106</a>             close(channel, succeededFuture(channel));
<a class="jxr_linenumber" name="107" href="#107">107</a>             <strong class="jxr_keyword">return</strong> false;
<a class="jxr_linenumber" name="108" href="#108">108</a>         }
<a class="jxr_linenumber" name="109" href="#109">109</a> 
<a class="jxr_linenumber" name="110" href="#110">110</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="111" href="#111">111</a>     }
<a class="jxr_linenumber" name="112" href="#112">112</a> 
<a class="jxr_linenumber" name="113" href="#113">113</a>     @Override
<a class="jxr_linenumber" name="114" href="#114">114</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> scheduleWriteIfNecessary(<strong class="jxr_keyword">final</strong> AbstractNioChannel&lt;?&gt; channel) {
<a class="jxr_linenumber" name="115" href="#115">115</a>         <strong class="jxr_keyword">final</strong> Thread workerThread = thread;
<a class="jxr_linenumber" name="116" href="#116">116</a>         <strong class="jxr_keyword">if</strong> (workerThread == <strong class="jxr_keyword">null</strong> || Thread.currentThread() != workerThread) {
<a class="jxr_linenumber" name="117" href="#117">117</a>             <strong class="jxr_keyword">if</strong> (channel.writeTaskInTaskQueue.compareAndSet(false, <strong class="jxr_keyword">true</strong>)) {
<a class="jxr_linenumber" name="118" href="#118">118</a>                 <em class="jxr_comment">// "add" the channels writeTask to the writeTaskQueue.</em>
<a class="jxr_linenumber" name="119" href="#119">119</a>                 registerTask(channel.writeTask);
<a class="jxr_linenumber" name="120" href="#120">120</a>             }
<a class="jxr_linenumber" name="121" href="#121">121</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="122" href="#122">122</a>         }
<a class="jxr_linenumber" name="123" href="#123">123</a> 
<a class="jxr_linenumber" name="124" href="#124">124</a>         <strong class="jxr_keyword">return</strong> false;
<a class="jxr_linenumber" name="125" href="#125">125</a>     }
<a class="jxr_linenumber" name="126" href="#126">126</a> 
<a class="jxr_linenumber" name="127" href="#127">127</a>     <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> disconnect(<a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramChannel.html">NioDatagramChannel</a> channel, <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> future) {
<a class="jxr_linenumber" name="128" href="#128">128</a>         <strong class="jxr_keyword">boolean</strong> connected = channel.isConnected();
<a class="jxr_linenumber" name="129" href="#129">129</a>         <strong class="jxr_keyword">boolean</strong> iothread = isIoThread(channel);
<a class="jxr_linenumber" name="130" href="#130">130</a>         <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="131" href="#131">131</a>             channel.getDatagramChannel().disconnect();
<a class="jxr_linenumber" name="132" href="#132">132</a>             future.setSuccess();
<a class="jxr_linenumber" name="133" href="#133">133</a>             <strong class="jxr_keyword">if</strong> (connected) {
<a class="jxr_linenumber" name="134" href="#134">134</a>                 <strong class="jxr_keyword">if</strong> (iothread) {
<a class="jxr_linenumber" name="135" href="#135">135</a>                     fireChannelDisconnected(channel);
<a class="jxr_linenumber" name="136" href="#136">136</a>                 } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="137" href="#137">137</a>                     fireChannelDisconnectedLater(channel);
<a class="jxr_linenumber" name="138" href="#138">138</a>                 }
<a class="jxr_linenumber" name="139" href="#139">139</a>             }
<a class="jxr_linenumber" name="140" href="#140">140</a>         } <strong class="jxr_keyword">catch</strong> (Throwable t) {
<a class="jxr_linenumber" name="141" href="#141">141</a>             future.setFailure(t);
<a class="jxr_linenumber" name="142" href="#142">142</a>             <strong class="jxr_keyword">if</strong> (iothread) {
<a class="jxr_linenumber" name="143" href="#143">143</a>                 fireExceptionCaught(channel, t);
<a class="jxr_linenumber" name="144" href="#144">144</a>             } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="145" href="#145">145</a>                 fireExceptionCaughtLater(channel, t);
<a class="jxr_linenumber" name="146" href="#146">146</a>             }
<a class="jxr_linenumber" name="147" href="#147">147</a>         }
<a class="jxr_linenumber" name="148" href="#148">148</a>     }
<a class="jxr_linenumber" name="149" href="#149">149</a> 
<a class="jxr_linenumber" name="150" href="#150">150</a>     @Override
<a class="jxr_linenumber" name="151" href="#151">151</a>     <strong class="jxr_keyword">protected</strong> Runnable createRegisterTask(<a href="../../../../../../org/jboss/netty/channel/Channel.html">Channel</a> channel, <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> future) {
<a class="jxr_linenumber" name="152" href="#152">152</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramWorker.html">ChannelRegistionTask</a>((NioDatagramChannel) channel, future);
<a class="jxr_linenumber" name="153" href="#153">153</a>     }
<a class="jxr_linenumber" name="154" href="#154">154</a> 
<a class="jxr_linenumber" name="155" href="#155">155</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment">     * RegisterTask is a task responsible for registering a channel with a</em>
<a class="jxr_linenumber" name="157" href="#157">157</a> <em class="jxr_javadoccomment">     * selector.</em>
<a class="jxr_linenumber" name="158" href="#158">158</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="159" href="#159">159</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramWorker.html">ChannelRegistionTask</a> <strong class="jxr_keyword">implements</strong> Runnable {
<a class="jxr_linenumber" name="160" href="#160">160</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramChannel.html">NioDatagramChannel</a> channel;
<a class="jxr_linenumber" name="161" href="#161">161</a> 
<a class="jxr_linenumber" name="162" href="#162">162</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> future;
<a class="jxr_linenumber" name="163" href="#163">163</a> 
<a class="jxr_linenumber" name="164" href="#164">164</a>         <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramWorker.html">ChannelRegistionTask</a>(<strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/NioDatagramChannel.html">NioDatagramChannel</a> channel,
<a class="jxr_linenumber" name="165" href="#165">165</a>                 <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> future) {
<a class="jxr_linenumber" name="166" href="#166">166</a>             <strong class="jxr_keyword">this</strong>.channel = channel;
<a class="jxr_linenumber" name="167" href="#167">167</a>             <strong class="jxr_keyword">this</strong>.future = future;
<a class="jxr_linenumber" name="168" href="#168">168</a>         }
<a class="jxr_linenumber" name="169" href="#169">169</a> 
<a class="jxr_linenumber" name="170" href="#170">170</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="171" href="#171">171</a> <em class="jxr_javadoccomment">         * This runnable's task. Does the actual registering by calling the</em>
<a class="jxr_linenumber" name="172" href="#172">172</a> <em class="jxr_javadoccomment">         * underlying DatagramChannels peer DatagramSocket register method.</em>
<a class="jxr_linenumber" name="173" href="#173">173</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="174" href="#174">174</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a class="jxr_linenumber" name="175" href="#175">175</a>             <strong class="jxr_keyword">final</strong> SocketAddress localAddress = channel.getLocalAddress();
<a class="jxr_linenumber" name="176" href="#176">176</a>             <strong class="jxr_keyword">if</strong> (localAddress == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="177" href="#177">177</a>                 <strong class="jxr_keyword">if</strong> (future != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="178" href="#178">178</a>                     future.setFailure(<strong class="jxr_keyword">new</strong> ClosedChannelException());
<a class="jxr_linenumber" name="179" href="#179">179</a>                 }
<a class="jxr_linenumber" name="180" href="#180">180</a>                 close(channel, succeededFuture(channel));
<a class="jxr_linenumber" name="181" href="#181">181</a>                 <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="182" href="#182">182</a>             }
<a class="jxr_linenumber" name="183" href="#183">183</a> 
<a class="jxr_linenumber" name="184" href="#184">184</a>             <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="185" href="#185">185</a>                 channel.getDatagramChannel().register(
<a class="jxr_linenumber" name="186" href="#186">186</a>                         selector, channel.getInternalInterestOps(), channel);
<a class="jxr_linenumber" name="187" href="#187">187</a> 
<a class="jxr_linenumber" name="188" href="#188">188</a>                 <strong class="jxr_keyword">if</strong> (future != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="189" href="#189">189</a>                     future.setSuccess();
<a class="jxr_linenumber" name="190" href="#190">190</a>                 }
<a class="jxr_linenumber" name="191" href="#191">191</a>             } <strong class="jxr_keyword">catch</strong> (<strong class="jxr_keyword">final</strong> IOException e) {
<a class="jxr_linenumber" name="192" href="#192">192</a>                 <strong class="jxr_keyword">if</strong> (future != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="193" href="#193">193</a>                     future.setFailure(e);
<a class="jxr_linenumber" name="194" href="#194">194</a>                 }
<a class="jxr_linenumber" name="195" href="#195">195</a>                 close(channel, succeededFuture(channel));
<a class="jxr_linenumber" name="196" href="#196">196</a> 
<a class="jxr_linenumber" name="197" href="#197">197</a>                 <strong class="jxr_keyword">if</strong> (!(e instanceof ClosedChannelException)) {
<a class="jxr_linenumber" name="198" href="#198">198</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/channel/ChannelException.html">ChannelException</a>(
<a class="jxr_linenumber" name="199" href="#199">199</a>                             <span class="jxr_string">"Failed to register a socket to the selector."</span>, e);
<a class="jxr_linenumber" name="200" href="#200">200</a>                 }
<a class="jxr_linenumber" name="201" href="#201">201</a>             }
<a class="jxr_linenumber" name="202" href="#202">202</a>         }
<a class="jxr_linenumber" name="203" href="#203">203</a>     }
<a class="jxr_linenumber" name="204" href="#204">204</a> 
<a class="jxr_linenumber" name="205" href="#205">205</a>     @Override
<a class="jxr_linenumber" name="206" href="#206">206</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> writeFromUserCode(<strong class="jxr_keyword">final</strong> AbstractNioChannel&lt;?&gt; channel) {
<a class="jxr_linenumber" name="207" href="#207">207</a>         <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="208" href="#208">208</a> <em class="jxr_comment">         * Note that we are not checking if the channel is connected. Connected</em>
<a class="jxr_linenumber" name="209" href="#209">209</a> <em class="jxr_comment">         * has a different meaning in UDP and means that the channels socket is</em>
<a class="jxr_linenumber" name="210" href="#210">210</a> <em class="jxr_comment">         * configured to only send and receive from a given remote peer.</em>
<a class="jxr_linenumber" name="211" href="#211">211</a> <em class="jxr_comment">         */</em>
<a class="jxr_linenumber" name="212" href="#212">212</a>         <strong class="jxr_keyword">if</strong> (!channel.isBound()) {
<a class="jxr_linenumber" name="213" href="#213">213</a>             cleanUpWriteBuffer(channel);
<a class="jxr_linenumber" name="214" href="#214">214</a>             <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="215" href="#215">215</a>         }
<a class="jxr_linenumber" name="216" href="#216">216</a> 
<a class="jxr_linenumber" name="217" href="#217">217</a>         <strong class="jxr_keyword">if</strong> (scheduleWriteIfNecessary(channel)) {
<a class="jxr_linenumber" name="218" href="#218">218</a>             <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="219" href="#219">219</a>         }
<a class="jxr_linenumber" name="220" href="#220">220</a> 
<a class="jxr_linenumber" name="221" href="#221">221</a>         <em class="jxr_comment">// From here, we are sure Thread.currentThread() == workerThread.</em>
<a class="jxr_linenumber" name="222" href="#222">222</a> 
<a class="jxr_linenumber" name="223" href="#223">223</a>         <strong class="jxr_keyword">if</strong> (channel.writeSuspended) {
<a class="jxr_linenumber" name="224" href="#224">224</a>             <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="225" href="#225">225</a>         }
<a class="jxr_linenumber" name="226" href="#226">226</a> 
<a class="jxr_linenumber" name="227" href="#227">227</a>         <strong class="jxr_keyword">if</strong> (channel.inWriteNowLoop) {
<a class="jxr_linenumber" name="228" href="#228">228</a>             <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="229" href="#229">229</a>         }
<a class="jxr_linenumber" name="230" href="#230">230</a> 
<a class="jxr_linenumber" name="231" href="#231">231</a>         write0(channel);
<a class="jxr_linenumber" name="232" href="#232">232</a>     }
<a class="jxr_linenumber" name="233" href="#233">233</a> 
<a class="jxr_linenumber" name="234" href="#234">234</a>     @Override
<a class="jxr_linenumber" name="235" href="#235">235</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> write0(<strong class="jxr_keyword">final</strong> AbstractNioChannel&lt;?&gt; channel) {
<a class="jxr_linenumber" name="236" href="#236">236</a> 
<a class="jxr_linenumber" name="237" href="#237">237</a>         <strong class="jxr_keyword">boolean</strong> addOpWrite = false;
<a class="jxr_linenumber" name="238" href="#238">238</a>         <strong class="jxr_keyword">boolean</strong> removeOpWrite = false;
<a class="jxr_linenumber" name="239" href="#239">239</a> 
<a class="jxr_linenumber" name="240" href="#240">240</a>         <strong class="jxr_keyword">long</strong> writtenBytes = 0;
<a class="jxr_linenumber" name="241" href="#241">241</a> 
<a class="jxr_linenumber" name="242" href="#242">242</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/SocketSendBufferPool.html">SocketSendBufferPool</a> sendBufferPool = <strong class="jxr_keyword">this</strong>.sendBufferPool;
<a class="jxr_linenumber" name="243" href="#243">243</a>         <strong class="jxr_keyword">final</strong> DatagramChannel ch = ((NioDatagramChannel) channel).getDatagramChannel();
<a class="jxr_linenumber" name="244" href="#244">244</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/socket/nio/AbstractNioChannel.html">WriteRequestQueue</a> writeBuffer = channel.writeBufferQueue;
<a class="jxr_linenumber" name="245" href="#245">245</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> writeSpinCount = channel.getConfig().getWriteSpinCount();
<a class="jxr_linenumber" name="246" href="#246">246</a>         <strong class="jxr_keyword">synchronized</strong> (channel.writeLock) {
<a class="jxr_linenumber" name="247" href="#247">247</a>             <em class="jxr_comment">// inform the channel that write is in-progress</em>
<a class="jxr_linenumber" name="248" href="#248">248</a>             channel.inWriteNowLoop = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="249" href="#249">249</a> 
<a class="jxr_linenumber" name="250" href="#250">250</a>             <em class="jxr_comment">// loop forever...</em>
<a class="jxr_linenumber" name="251" href="#251">251</a>             <strong class="jxr_keyword">for</strong> (;;) {
<a class="jxr_linenumber" name="252" href="#252">252</a>                 <a href="../../../../../../org/jboss/netty/channel/MessageEvent.html">MessageEvent</a> evt = channel.currentWriteEvent;
<a class="jxr_linenumber" name="253" href="#253">253</a>                 SocketSendBufferPool.SendBuffer buf;
<a class="jxr_linenumber" name="254" href="#254">254</a>                 <strong class="jxr_keyword">if</strong> (evt == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="255" href="#255">255</a>                     <strong class="jxr_keyword">if</strong> ((channel.currentWriteEvent = evt = writeBuffer.poll()) == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="256" href="#256">256</a>                         removeOpWrite = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="257" href="#257">257</a>                         channel.writeSuspended = false;
<a class="jxr_linenumber" name="258" href="#258">258</a>                         <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="259" href="#259">259</a>                     }
<a class="jxr_linenumber" name="260" href="#260">260</a> 
<a class="jxr_linenumber" name="261" href="#261">261</a>                     channel.currentWriteBuffer = buf = sendBufferPool.acquire(evt.getMessage());
<a class="jxr_linenumber" name="262" href="#262">262</a>                 } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="263" href="#263">263</a>                     buf = channel.currentWriteBuffer;
<a class="jxr_linenumber" name="264" href="#264">264</a>                 }
<a class="jxr_linenumber" name="265" href="#265">265</a> 
<a class="jxr_linenumber" name="266" href="#266">266</a>                 <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="267" href="#267">267</a>                     <strong class="jxr_keyword">long</strong> localWrittenBytes = 0;
<a class="jxr_linenumber" name="268" href="#268">268</a>                     SocketAddress raddr = evt.getRemoteAddress();
<a class="jxr_linenumber" name="269" href="#269">269</a>                     <strong class="jxr_keyword">if</strong> (raddr == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="270" href="#270">270</a>                         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = writeSpinCount; i &gt; 0; i --) {
<a class="jxr_linenumber" name="271" href="#271">271</a>                             localWrittenBytes = buf.transferTo(ch);
<a class="jxr_linenumber" name="272" href="#272">272</a>                             <strong class="jxr_keyword">if</strong> (localWrittenBytes != 0) {
<a class="jxr_linenumber" name="273" href="#273">273</a>                                 writtenBytes += localWrittenBytes;
<a class="jxr_linenumber" name="274" href="#274">274</a>                                 <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="275" href="#275">275</a>                             }
<a class="jxr_linenumber" name="276" href="#276">276</a>                             <strong class="jxr_keyword">if</strong> (buf.finished()) {
<a class="jxr_linenumber" name="277" href="#277">277</a>                                 <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="278" href="#278">278</a>                             }
<a class="jxr_linenumber" name="279" href="#279">279</a>                         }
<a class="jxr_linenumber" name="280" href="#280">280</a>                     } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="281" href="#281">281</a>                         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = writeSpinCount; i &gt; 0; i --) {
<a class="jxr_linenumber" name="282" href="#282">282</a>                             localWrittenBytes = buf.transferTo(ch, raddr);
<a class="jxr_linenumber" name="283" href="#283">283</a>                             <strong class="jxr_keyword">if</strong> (localWrittenBytes != 0) {
<a class="jxr_linenumber" name="284" href="#284">284</a>                                 writtenBytes += localWrittenBytes;
<a class="jxr_linenumber" name="285" href="#285">285</a>                                 <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="286" href="#286">286</a>                             }
<a class="jxr_linenumber" name="287" href="#287">287</a>                             <strong class="jxr_keyword">if</strong> (buf.finished()) {
<a class="jxr_linenumber" name="288" href="#288">288</a>                                 <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="289" href="#289">289</a>                             }
<a class="jxr_linenumber" name="290" href="#290">290</a>                         }
<a class="jxr_linenumber" name="291" href="#291">291</a>                     }
<a class="jxr_linenumber" name="292" href="#292">292</a> 
<a class="jxr_linenumber" name="293" href="#293">293</a>                     <strong class="jxr_keyword">if</strong> (localWrittenBytes &gt; 0 || buf.finished()) {
<a class="jxr_linenumber" name="294" href="#294">294</a>                         <em class="jxr_comment">// Successful write - proceed to the next message.</em>
<a class="jxr_linenumber" name="295" href="#295">295</a>                         buf.release();
<a class="jxr_linenumber" name="296" href="#296">296</a>                         <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> future = evt.getFuture();
<a class="jxr_linenumber" name="297" href="#297">297</a>                         channel.currentWriteEvent = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="298" href="#298">298</a>                         channel.currentWriteBuffer = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="299" href="#299">299</a>                         evt = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="300" href="#300">300</a>                         buf = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="301" href="#301">301</a>                         future.setSuccess();
<a class="jxr_linenumber" name="302" href="#302">302</a>                     } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="303" href="#303">303</a>                         <em class="jxr_comment">// Not written at all - perhaps the kernel buffer is full.</em>
<a class="jxr_linenumber" name="304" href="#304">304</a>                         addOpWrite = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="305" href="#305">305</a>                         channel.writeSuspended = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="306" href="#306">306</a>                         <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="307" href="#307">307</a>                     }
<a class="jxr_linenumber" name="308" href="#308">308</a>                 } <strong class="jxr_keyword">catch</strong> (<strong class="jxr_keyword">final</strong> AsynchronousCloseException e) {
<a class="jxr_linenumber" name="309" href="#309">309</a>                     <em class="jxr_comment">// Doesn't need a user attention - ignore.</em>
<a class="jxr_linenumber" name="310" href="#310">310</a>                 } <strong class="jxr_keyword">catch</strong> (<strong class="jxr_keyword">final</strong> Throwable t) {
<a class="jxr_linenumber" name="311" href="#311">311</a>                     buf.release();
<a class="jxr_linenumber" name="312" href="#312">312</a>                     <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> future = evt.getFuture();
<a class="jxr_linenumber" name="313" href="#313">313</a>                     channel.currentWriteEvent = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="314" href="#314">314</a>                     channel.currentWriteBuffer = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="315" href="#315">315</a>                     <em class="jxr_comment">// Mark the event object for garbage collection.</em>
<a class="jxr_linenumber" name="316" href="#316">316</a>                     <em class="jxr_comment">//noinspection UnusedAssignment</em>
<a class="jxr_linenumber" name="317" href="#317">317</a>                     buf = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="318" href="#318">318</a>                     <em class="jxr_comment">//noinspection UnusedAssignment</em>
<a class="jxr_linenumber" name="319" href="#319">319</a>                     evt = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="320" href="#320">320</a>                     future.setFailure(t);
<a class="jxr_linenumber" name="321" href="#321">321</a>                     fireExceptionCaught(channel, t);
<a class="jxr_linenumber" name="322" href="#322">322</a>                 }
<a class="jxr_linenumber" name="323" href="#323">323</a>             }
<a class="jxr_linenumber" name="324" href="#324">324</a>             channel.inWriteNowLoop = false;
<a class="jxr_linenumber" name="325" href="#325">325</a> 
<a class="jxr_linenumber" name="326" href="#326">326</a>             <em class="jxr_comment">// Initially, the following block was executed after releasing</em>
<a class="jxr_linenumber" name="327" href="#327">327</a>             <em class="jxr_comment">// the writeLock, but there was a race condition, and it has to be</em>
<a class="jxr_linenumber" name="328" href="#328">328</a>             <em class="jxr_comment">// executed before releasing the writeLock:</em>
<a class="jxr_linenumber" name="329" href="#329">329</a>             <em class="jxr_comment">//</em>
<a class="jxr_linenumber" name="330" href="#330">330</a>             <em class="jxr_comment">// https://issues.jboss.org/browse/NETTY-410</em>
<a class="jxr_linenumber" name="331" href="#331">331</a>             <em class="jxr_comment">//</em>
<a class="jxr_linenumber" name="332" href="#332">332</a>             <strong class="jxr_keyword">if</strong> (addOpWrite) {
<a class="jxr_linenumber" name="333" href="#333">333</a>                 setOpWrite(channel);
<a class="jxr_linenumber" name="334" href="#334">334</a>             } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (removeOpWrite) {
<a class="jxr_linenumber" name="335" href="#335">335</a>                 clearOpWrite(channel);
<a class="jxr_linenumber" name="336" href="#336">336</a>             }
<a class="jxr_linenumber" name="337" href="#337">337</a>         }
<a class="jxr_linenumber" name="338" href="#338">338</a> 
<a class="jxr_linenumber" name="339" href="#339">339</a>         fireWriteComplete(channel, writtenBytes);
<a class="jxr_linenumber" name="340" href="#340">340</a>     }
<a class="jxr_linenumber" name="341" href="#341">341</a> 
<a class="jxr_linenumber" name="342" href="#342">342</a>     @Override
<a class="jxr_linenumber" name="343" href="#343">343</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a class="jxr_linenumber" name="344" href="#344">344</a>         <strong class="jxr_keyword">super</strong>.run();
<a class="jxr_linenumber" name="345" href="#345">345</a>         bufferAllocator.releaseExternalResources();
<a class="jxr_linenumber" name="346" href="#346">346</a>     }
<a class="jxr_linenumber" name="347" href="#347">347</a> }
</pre>
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